Roll src/third_party/perfetto 860e0e564df9..79994d4369cf (4 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/860e0e564df9..79994d4369cf

git log 860e0e564df9..79994d4369cf --date=short --first-parent --format='%ad %ae %s'
2019-12-19 lalitm@google.com trace_processor: rename timestamp -> ts
2019-12-19 lalitm@google.com Merge "build: add example api target"
2019-12-19 lalitm@google.com Merge "trace_processor: revamp Android CPU metric"
2019-12-19 lalitm@google.com Merge "perfetto: remove redundant genrule in ipc target"

Created with:
  gclient setdep -r src/third_party/perfetto@79994d4369cf

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/perfetto-chromium-autoroll
Please CC perfetto-bugs@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: perfetto-bugs@google.com
Change-Id: I73286c4886054ef539ef6cb36fc5a47d82877f17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1976096Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#726391}

DEPS

@@ -1282,7 +1282,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '860e0e564df90b665360fdc5e47333111cc286e9',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '79994d4369cf681b3746e1a7151596d2d0a25186',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',